|Publication number||US7467466 B2|
|Application number||US 11/308,863|
|Publication date||Dec 23, 2008|
|Filing date||May 16, 2006|
|Priority date||Sep 30, 2005|
|Also published as||CN1940452A, US20070074395|
|Publication number||11308863, 308863, US 7467466 B2, US 7467466B2, US-B2-7467466, US7467466 B2, US7467466B2|
|Inventors||Chuen-Shu Hou, Chao-Nien Tung, Tay-Jian Liu|
|Original Assignee||Foxconn Technology Co., Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (13), Referenced by (1), Classifications (28), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Relevant subject matter is disclosed in a co-pending U.S. patent application Ser. No. 11/308,376, filed on Mar. 20, 2006 and entitled “METHOD AND APPARATUS FOR MAKING HEAT-DISSIPATION DEVICE HAVING VACUUM CHAMBER AND WORKING FLUID THEREIN”, which is assigned to the same assignee with this application. The disclosures of the co-pending application are wholly incorporated herein by reference.
The present invention relates to a method for sealing a heat pipe.
Today, heat pipes are among the chief instruments used to keep electronic components such as central processing units (CPUs) working within a tolerable range of temperature. A heat pipe usually includes a cylindrical body with a cavity defined therein and a quantity of working fluid contained in the cavity. The heat pipes transfer heat originating at the CPUs away through phase transition of the working fluid; the cavities inside the pipes are vacuum-exhausted to form a vacuum thus making the working fluid easy to evaporate. The more perfect the vacuum in the heat pipe, the lower the temperature at which the heat pipe begins to work. Thus, it is necessary for the heat pipe to be hermetically sealed after being vacuum-exhausted, thus forming a sealing structure. The sealing structure of the heat pipe is used for preventing air outside the heat pipe from entering into the heat pipe. Many researchers in this area are looking for a method for sealing a heat pipe, which may keep the pressure in the heat pipe within a certain range.
A conventional method for sealing a heat pipe is illustrated in
Step 1: providing a metallic hollow body 4 with an open end portion;
Step 2: pressing the open end portion of the hollow body 4 using a pair of pressing molds 2 to form a flatten end portion 6 closing the open end portion;
Step 3: cutting a top end of the flatten end portion 6 and sealing the heat pipe by using a spot welding device to achieve a two layer sealed structure.
As described above, the sealing structure is of double layers of transformative metal; the metal has flexibility and is prone to resile (i.e. return to its previous form), which may adversely result in tiny slots or pores forming on an interface between the two layers. As shown in
What is needed, therefore, is a method for sealing the same, which can overcome the above-described disadvantage of the prior art.
A method for sealing a heat pipe, comprises the steps of: providing a metallic pipe with an end sealed and an opposite open portion; pressing the open portion of the pipe to form a two layer portion by using two pairs of pressing molds; welding an end part of the two layer portion to form a sealing structure, during which at least one pair of pressing molds continues pressing the two layer portion; and then moving the at least one pair of pressing molds away from the sealing structure.
Other advantages and novel features will become more apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings, in which:
Many aspects of the present method can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present method. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
A method for forming the sealing structure 120 of the heat pipe 100 in accordance with a preferred embodiment, comprises the following steps.
Step (1) Providing a metallic hollow pipe 10.
As shown in
Step (2) Transversely pressing the open portion 14 of the pipe 10 to form a flattened portion 18 which constitutes the initial closing of the open portion 14.
As shown in
Step (3) using a cutting machine 40 to cut off a part of the flattened portion 18, that is a top end part thereof, which is high above the first pressing molds 32.
Step (4) moving the first pressing molds 32 away from the flattened portion 18, and keeping the second pressing molds 34 tightly pressed against the flattened portion 18 at the same time; thus, the second pressing molds 34 may prevent the layers of the flattened portion 18 from resiling before finishing the next operation of welding.
Step (5) welding a distal part of the flattened portion 18 to form the sealing structure 120, moving the second pressing molds 34 away from the flattened portion 18 after the welding operation. Then, the process of sealing the heat pipe 100 is completely finished. The welding preferably is performed by using an argon arc welding or laser welding to melt the distal part of the flattened portion 18.
As shown in
As shown in
As described above, the method for sealing heat pipes in accordance with preferred embodiments keep the second pressing molds 34 pressing the layers of the flattened portion 18 during the welding operation, which is able to prevent the layers of the flattened portion 18 from resiling before the welding operation is finished. Therefore, the problems of the conventional method can be solved by this method.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
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|US20060283578 *||Aug 24, 2006||Dec 21, 2006||Hul-Chun Hsu||Method for Removing Vapor within Heat Pipe|
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|JPS61134592A||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US20160288277 *||Apr 2, 2015||Oct 6, 2016||Asia Vital Components Co., Ltd.||Method of manufacturing heat dissipation device|
|U.S. Classification||29/890.032, 165/104.19, 165/104.26, 29/890.053, 165/104.18, 29/890.03, 165/104.21, 29/505, 257/E23.088, 29/890.054|
|International Classification||B23P5/00, F28D15/00, B21D21/00|
|Cooperative Classification||Y10T29/49908, Y10T29/49353, Y10T29/49393, Y10T29/4935, Y10T29/49391, H01L21/4882, F28D15/04, B23P2700/09, F28D15/0283, H01L23/427, B23P15/26, H01L2924/0002|
|European Classification||B23P15/26, F28D15/02P, H01L21/48C5P|
|May 16, 2006||AS||Assignment|
Owner name: FOXCONN TECHNOLOGY CO., LTD., TAIWAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HOU, CHUEN-SHU;TUNG, CHAO-NIEN;LIU, TAY-JIAN;REEL/FRAME:017624/0808
Effective date: 20060428
|Aug 6, 2012||REMI||Maintenance fee reminder mailed|
|Dec 23, 2012||LAPS||Lapse for failure to pay maintenance fees|
|Feb 12, 2013||FP||Expired due to failure to pay maintenance fee|
Effective date: 20121223